421822 has 4 divisors (see below), whose sum is σ = 632736. Its totient is φ = 210910.

The previous prime is 421807. The next prime is 421831. The reversal of 421822 is 228124.

421822 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It is a pancake number, because a pancake can be divided into 421822 parts by 918 straight cuts.

It is a self number, because there is not a number n which added to its sum of digits gives 421822.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 105454 + ... + 105457.

It is an arithmetic number, because the mean of its divisors is an integer number (158184).

2⁴²¹⁸²² is an apocalyptic number.

421822 is a deficient number, since it is larger than the sum of its proper divisors (210914).

421822 is a wasteful number, since it uses less digits than its factorization.

421822 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 210913.

The product of its digits is 256, while the sum is 19.

The square root of 421822 is about 649.4782521378. The cubic root of 421822 is about 74.9968591277.

Adding to 421822 its reverse (228124), we get a palindrome (649946).

The spelling of 421822 in words is "four hundred twenty-one thousand, eight hundred twenty-two".